The manual fire alarm buttons are an important part of a fire alarm system; particularly in petrochemical plant area, it is even a major device of fire alarm at site.
火灾手动报警按钮是火灾报警系统的重要组成部分，尤其在石油化工生产装置区域，更是一种主要的现场火灾报警设施。
The manual fire alarm buttons are an important part of a fire alarm system; particularly in petrochemical plant area, it is even a major device of fire alarm at site.
火灾手动报警按钮是火灾报警系统的重要组成部分，尤其在石油化工生产装置区域，更是一种主要的现场火灾报警设施。
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